I think you mean who will protect the interests of the consumer? That's ultimately who loses to unions. There's no direct ethical value in protecting businesses or their owners but workers and consumers include pretty much all humans and their interests are in tension with each other.
Not generally, no. Workers usually do have choice - they can work in a less desirable job, just as consumers can buy a less desirable product. At the extremes, both are serious - workers without income can starve and consumers for whom food is too expensive can starve.
